355nm激光作用下熔石英损伤增长

Growth of laser initiated damage in fused silica at 355 nm

用355 nm脉冲激光分别辐照位于熔石英前后表面的损伤点,用Mias软件采集了损伤增长的图像并测量了每脉冲辐照后损伤点的面积。实验结果表明:位于熔石英样片后表面的损伤点面积随激光辐照脉冲数呈指数增长关系,而位于前表面的损伤点面积与激光辐照脉冲次数呈线性增长关系。

The damaged sites located on input and exit surface have been irradiated respectively with 355 nm pulse laser. After each shot, photograph of growth of the damaged site has been taken and the area of the damaged site has been measured. Experimental results show exponential growth in the lateral size of damage sites located on exit surface with shot number, whereas linear growth in the lateral site of damage sites located on input surface.